Inorganic Chemicals Industry >
Corrosion behavior of austenitic stainless steel exposed to the vapor above boron-containing solution
Received date: 2021-04-06
Online published: 2022-03-14
With the widespread use of boric acid,the corrosion problem of equipments exposed to boric acid-containing medi-um cannot be ignored.Based on the actual situation of the equipment tip corrosion in the boron-containing solution circulating system of nuclear power plant,the corrosion behavior of 304 austenitic stainless steel exposed to the vapor above boron-con-taining solution at a given temperature and a certain boron concentration was studied,and contrasting the vapor phase corro-sion with the corresponding solution corrosion was also discussed.The oxide films formed on the surface of specimens were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS).The result indicated that the corrosion of 304 stainless steel exposed to boron-containing vapor was more serious than that exposed to boron-containing solution at 180 ℃ when the corrosion test was carried out for 1 200 h.In spite of forming double-layer oxide films on the samples in both boron-containing vapor and solution,it was noted that the surface layer of the oxide film formed in boron-containing vapor was rich in Fe and Ni,while the surface layer of the oxide film formed in boron-containing solution was rich in Cr.This phenomenon was elucidated by the formation mechanism of oxide film.
Key words: austenitic stainless steel; boron-containing vapor; oxide film
Dingding WEI , Jianchu ZHONG , Guiling NING . Corrosion behavior of austenitic stainless steel exposed to the vapor above boron-containing solution[J]. Inorganic Chemicals Industry, 2022 , 54(2) : 85 -89 . DOI: 10.19964/j.issn.1006-4990.2021-0225
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